2 * Copyright (C) 2007,2008,2009 Red Hat, Inc.
4 * This is part of HarfBuzz, an OpenType Layout engine library.
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 * Red Hat Author(s): Behdad Esfahbod
27 #ifndef HB_OT_LAYOUT_COMMON_PRIVATE_HH
28 #define HB_OT_LAYOUT_COMMON_PRIVATE_HH
30 #include "hb-ot-layout-private.h"
32 #include "hb-open-type-private.hh"
35 #define NO_CONTEXT ((unsigned int) 0x110000)
36 #define NOT_COVERED ((unsigned int) 0x110000)
37 #define MAX_NESTING_LEVEL 8
42 * OpenType Layout Common Table Formats
48 * Script, ScriptList, LangSys, Feature, FeatureList, Lookup, LookupList
51 template <typename Type>
54 inline bool sanitize (SANITIZE_ARG_DEF, const void *base) {
56 return SANITIZE (tag) && SANITIZE_BASE (offset, base);
59 Tag tag; /* 4-byte Tag identifier */
61 offset; /* Offset from beginning of object holding
65 template <typename Type>
66 struct RecordArrayOf : ArrayOf<Record<Type> > {
67 inline const Tag& get_tag (unsigned int i) const
69 if (HB_UNLIKELY (i >= this->len)) return Null(Tag);
70 return (*this)[i].tag;
72 inline unsigned int get_tags (unsigned int start_offset,
73 unsigned int *record_count /* IN/OUT */,
74 hb_tag_t *record_tags /* OUT */) const
77 unsigned int count = MIN (MIN (0, (unsigned int) this->len - start_offset), *record_count);
78 const Record<Type> *array = this->const_array() + start_offset;
79 for (unsigned int i = 0; i < count; i++)
80 record_tags[i] = array[i].tag;
82 *record_count = this->len;
86 inline bool find_index (hb_tag_t tag, unsigned int *index) const
90 const Record<Type> *a = this->const_array();
91 unsigned int count = this->len;
92 for (unsigned int i = 0; i < count; i++)
96 if (index) *index = i;
100 if (index) *index = NO_INDEX;
105 template <typename Type>
106 struct RecordListOf : RecordArrayOf<Type>
108 inline const Type& operator [] (unsigned int i) const
109 { return this+RecordArrayOf<Type>::operator [](i).offset; }
111 inline bool sanitize (SANITIZE_ARG_DEF) {
113 return RecordArrayOf<Type>::sanitize (SANITIZE_ARG, CONST_CHARP(this));
118 struct IndexArray : ArrayOf<USHORT>
120 inline unsigned int operator [] (unsigned int i) const
122 if (HB_UNLIKELY (i >= this->len))
124 return this->const_array()[i];
126 inline unsigned int get_indexes (unsigned int start_offset,
127 unsigned int *_count /* IN/OUT */,
128 unsigned int *_indexes /* OUT */) const
131 unsigned int count = MIN (MIN (0, (unsigned int) this->len - start_offset), *_count);
132 const USHORT *array = this->const_array() + start_offset;
133 for (unsigned int i = 0; i < count; i++)
134 _indexes[i] = array[i];
150 inline unsigned int get_feature_count (void) const
151 { return featureIndex.len; }
152 inline hb_tag_t get_feature_index (unsigned int i) const
153 { return featureIndex[i]; }
154 inline unsigned int get_feature_indexes (unsigned int start_offset,
155 unsigned int *feature_count /* IN/OUT */,
156 unsigned int *feature_indexes /* OUT */) const
157 { return featureIndex.get_indexes (start_offset, feature_count, feature_indexes); }
159 inline bool has_required_feature (void) const { return reqFeatureIndex != 0xffff; }
160 inline int get_required_feature_index (void) const
162 if (reqFeatureIndex == 0xffff)
164 return reqFeatureIndex;;
167 inline bool sanitize (SANITIZE_ARG_DEF) {
169 return SANITIZE_SELF () && SANITIZE (featureIndex);
172 Offset lookupOrder; /* = Null (reserved for an offset to a
173 * reordering table) */
174 USHORT reqFeatureIndex;/* Index of a feature required for this
175 * language system--if no required features
177 IndexArray featureIndex; /* Array of indices into the FeatureList */
179 ASSERT_SIZE_DATA (LangSys, 6, "\0\0\xFF\xFF");
184 inline unsigned int get_lang_sys_count (void) const
185 { return langSys.len; }
186 inline const Tag& get_lang_sys_tag (unsigned int i) const
187 { return langSys.get_tag (i); }
188 inline unsigned int get_lang_sys_tags (unsigned int start_offset,
189 unsigned int *lang_sys_count /* IN/OUT */,
190 hb_tag_t *lang_sys_tags /* OUT */) const
191 { return langSys.get_tags (start_offset, lang_sys_count, lang_sys_tags); }
192 inline const LangSys& get_lang_sys (unsigned int i) const
194 if (i == NO_INDEX) return get_default_lang_sys ();
195 return this+langSys[i].offset;
197 inline bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
198 { return langSys.find_index (tag, index); }
200 inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
201 inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
203 inline bool sanitize (SANITIZE_ARG_DEF) {
205 return SANITIZE_THIS (defaultLangSys) && SANITIZE_THIS (langSys);
210 defaultLangSys; /* Offset to DefaultLangSys table--from
211 * beginning of Script table--may be Null */
212 RecordArrayOf<LangSys>
213 langSys; /* Array of LangSysRecords--listed
214 * alphabetically by LangSysTag */
216 ASSERT_SIZE (Script, 4);
218 typedef RecordListOf<Script> ScriptList;
219 ASSERT_SIZE (ScriptList, 2);
224 inline unsigned int get_lookup_count (void) const
225 { return lookupIndex.len; }
226 inline hb_tag_t get_lookup_index (unsigned int i) const
227 { return lookupIndex[i]; }
228 inline unsigned int get_lookup_indexes (unsigned int start_index,
229 unsigned int *lookup_count /* IN/OUT */,
230 unsigned int *lookup_tags /* OUT */) const
231 { return lookupIndex.get_indexes (start_index, lookup_count, lookup_tags); }
233 inline bool sanitize (SANITIZE_ARG_DEF) {
235 return SANITIZE_SELF () && SANITIZE (lookupIndex);
238 /* TODO: implement get_feature_parameters() */
239 /* TODO: implement FeatureSize and other special features? */
240 Offset featureParams; /* Offset to Feature Parameters table (if one
241 * has been defined for the feature), relative
242 * to the beginning of the Feature Table; = Null
244 IndexArray lookupIndex; /* Array of LookupList indices */
246 ASSERT_SIZE (Feature, 4);
248 typedef RecordListOf<Feature> FeatureList;
249 ASSERT_SIZE (FeatureList, 2);
252 struct LookupFlag : USHORT
255 RightToLeft = 0x0001u,
256 IgnoreBaseGlyphs = 0x0002u,
257 IgnoreLigatures = 0x0004u,
258 IgnoreMarks = 0x0008u,
259 IgnoreFlags = 0x000Eu,
260 UseMarkFilteringSet = 0x0010u,
262 MarkAttachmentType = 0xFF00u
265 ASSERT_SIZE (LookupFlag, 2);
267 struct LookupSubTable
269 inline bool sanitize (SANITIZE_ARG_DEF) {
271 return SANITIZE_SELF ();
275 USHORT format; /* Subtable format. Different for GSUB and GPOS */
277 ASSERT_SIZE (LookupSubTable, 2);
281 inline const LookupSubTable& get_subtable (unsigned int i) const { return this+subTable[i]; }
282 inline unsigned int get_subtable_count (void) const { return subTable.len; }
284 inline unsigned int get_type (void) const { return lookupType; }
285 inline unsigned int get_flag (void) const
287 unsigned int flag = lookupFlag;
288 if (HB_UNLIKELY (flag & LookupFlag::UseMarkFilteringSet))
290 const USHORT &markFilteringSet = CONST_NEXT (USHORT, subTable);
291 flag += (markFilteringSet << 16);
296 inline bool sanitize (SANITIZE_ARG_DEF) {
298 if (!(SANITIZE_SELF/*XXXXXXXXXXXXXX*/ () && SANITIZE_THIS (subTable))) return false;
299 if (HB_UNLIKELY (lookupFlag & LookupFlag::UseMarkFilteringSet))
301 USHORT &markFilteringSet = NEXT (USHORT, subTable);
302 if (!SANITIZE (markFilteringSet)) return false;
307 USHORT lookupType; /* Different enumerations for GSUB and GPOS */
308 USHORT lookupFlag; /* Lookup qualifiers */
309 OffsetArrayOf<LookupSubTable>
310 subTable; /* Array of SubTables */
311 USHORT markFilteringSetX[VAR]; /* Index (base 0) into GDEF mark glyph sets
312 * structure. This field is only present if bit
313 * UseMarkFilteringSet of lookup flags is set. */
315 ASSERT_SIZE_VAR (Lookup, 6, USHORT);
317 typedef OffsetListOf<Lookup> LookupList;
318 ASSERT_SIZE (LookupList, 2);
325 struct CoverageFormat1
327 friend struct Coverage;
330 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
332 if (HB_UNLIKELY (glyph_id > 0xFFFF))
337 unsigned int num_glyphs = glyphArray.len;
338 for (unsigned int i = 0; i < num_glyphs; i++)
339 if (gid == glyphArray[i])
344 inline bool sanitize (SANITIZE_ARG_DEF) {
346 return SANITIZE (glyphArray);
350 USHORT coverageFormat; /* Format identifier--format = 1 */
352 glyphArray; /* Array of GlyphIDs--in numerical order */
354 ASSERT_SIZE (CoverageFormat1, 4);
356 struct CoverageRangeRecord
358 friend struct CoverageFormat2;
361 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
363 if (glyph_id >= start && glyph_id <= end)
364 return (unsigned int) startCoverageIndex + (glyph_id - start);
369 inline bool sanitize (SANITIZE_ARG_DEF) {
371 return SANITIZE_SELF ();
375 GlyphID start; /* First GlyphID in the range */
376 GlyphID end; /* Last GlyphID in the range */
377 USHORT startCoverageIndex; /* Coverage Index of first GlyphID in
380 ASSERT_SIZE_DATA (CoverageRangeRecord, 6, "\000\001");
382 struct CoverageFormat2
384 friend struct Coverage;
387 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
390 unsigned int count = rangeRecord.len;
391 for (unsigned int i = 0; i < count; i++)
393 unsigned int coverage = rangeRecord[i].get_coverage (glyph_id);
394 if (coverage != NOT_COVERED)
400 inline bool sanitize (SANITIZE_ARG_DEF) {
402 return SANITIZE (rangeRecord);
406 USHORT coverageFormat; /* Format identifier--format = 2 */
407 ArrayOf<CoverageRangeRecord>
408 rangeRecord; /* Array of glyph ranges--ordered by
409 * Start GlyphID. rangeCount entries
412 ASSERT_SIZE (CoverageFormat2, 4);
416 inline unsigned int operator() (hb_codepoint_t glyph_id) const { return get_coverage (glyph_id); }
418 inline unsigned int get_coverage (hb_codepoint_t glyph_id) const
421 case 1: return u.format1->get_coverage(glyph_id);
422 case 2: return u.format2->get_coverage(glyph_id);
423 default:return NOT_COVERED;
427 inline bool sanitize (SANITIZE_ARG_DEF) {
429 if (!SANITIZE (u.format)) return false;
431 case 1: return u.format1->sanitize (SANITIZE_ARG);
432 case 2: return u.format2->sanitize (SANITIZE_ARG);
439 USHORT format; /* Format identifier */
440 CoverageFormat1 format1[VAR];
441 CoverageFormat2 format2[VAR];
447 * Class Definition Table
450 struct ClassDefFormat1
452 friend struct ClassDef;
455 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
457 if ((unsigned int) (glyph_id - startGlyph) < classValue.len)
458 return classValue[glyph_id - startGlyph];
462 inline bool sanitize (SANITIZE_ARG_DEF) {
464 return SANITIZE_SELF () && SANITIZE (classValue);
467 USHORT classFormat; /* Format identifier--format = 1 */
468 GlyphID startGlyph; /* First GlyphID of the classValueArray */
470 classValue; /* Array of Class Values--one per GlyphID */
472 ASSERT_SIZE (ClassDefFormat1, 6);
474 struct ClassRangeRecord
476 friend struct ClassDefFormat2;
479 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
481 if (glyph_id >= start && glyph_id <= end)
487 inline bool sanitize (SANITIZE_ARG_DEF) {
489 return SANITIZE_SELF ();
493 GlyphID start; /* First GlyphID in the range */
494 GlyphID end; /* Last GlyphID in the range */
495 USHORT classValue; /* Applied to all glyphs in the range */
497 ASSERT_SIZE_DATA (ClassRangeRecord, 6, "\000\001");
499 struct ClassDefFormat2
501 friend struct ClassDef;
504 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
507 unsigned int count = rangeRecord.len;
508 for (unsigned int i = 0; i < count; i++)
510 int classValue = rangeRecord[i].get_class (glyph_id);
517 inline bool sanitize (SANITIZE_ARG_DEF) {
519 return SANITIZE (rangeRecord);
522 USHORT classFormat; /* Format identifier--format = 2 */
523 ArrayOf<ClassRangeRecord>
524 rangeRecord; /* Array of glyph ranges--ordered by
527 ASSERT_SIZE (ClassDefFormat2, 4);
531 inline unsigned int operator() (hb_codepoint_t glyph_id) const { return get_class (glyph_id); }
533 inline hb_ot_layout_class_t get_class (hb_codepoint_t glyph_id) const
536 case 1: return u.format1->get_class(glyph_id);
537 case 2: return u.format2->get_class(glyph_id);
542 inline bool sanitize (SANITIZE_ARG_DEF) {
544 if (!SANITIZE (u.format)) return false;
546 case 1: return u.format1->sanitize (SANITIZE_ARG);
547 case 2: return u.format2->sanitize (SANITIZE_ARG);
554 USHORT format; /* Format identifier */
555 ClassDefFormat1 format1[VAR];
556 ClassDefFormat2 format2[VAR];
567 inline int operator() (unsigned int ppem_size) const { return get_delta (ppem_size); }
569 inline int get_delta (unsigned int ppem_size) const
571 unsigned int f = deltaFormat;
572 if (HB_UNLIKELY (f < 1 || f > 3))
575 if (ppem_size < startSize || ppem_size > endSize)
578 unsigned int s = ppem_size - startSize;
580 unsigned int byte = deltaValue[s >> (4 - f)];
581 unsigned int bits = (byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f)));
582 unsigned int mask = (0xFFFF >> (16 - (1 << f)));
584 int delta = bits & mask;
586 if ((unsigned int) delta >= ((mask + 1) >> 1))
592 inline unsigned int get_size () const
594 unsigned int f = deltaFormat;
595 if (HB_UNLIKELY (f < 1 || f > 3 || startSize > endSize)) return sizeof (*this);
596 return sizeof (*this) + ((endSize - startSize + (1 << (4 - f)) - 1) >> (4 - f));
599 inline bool sanitize (SANITIZE_ARG_DEF) {
601 return SANITIZE_GET_SIZE ();
605 USHORT startSize; /* Smallest size to correct--in ppem */
606 USHORT endSize; /* Largest size to correct--in ppem */
607 USHORT deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3 */
608 USHORT deltaValue[VAR]; /* Array of compressed data */
610 ASSERT_SIZE_VAR (Device, 6, USHORT);
613 #endif /* HB_OT_LAYOUT_COMMON_PRIVATE_HH */